What Adhesive is Right for Your Project

February 10, 2018 9 Comments

WHAT ADHESIVE IS RIGHT FOR YOUR PROJECT

When creating a mosaic it is important to choose the correct adhesive and ensure that it is compatible with the base or substrate you are using. To help you choose the correct adhesive we have complied this quick reference guide.

 

Adhesives can be applied with a toothpick, small palette knife, paddle pop stick, paint brush, a butter knife or even a piping bag.

Adhesive Type Description Usage

PVA - Polyvinyl Acetate (also known as craft or wood glue)

White glue that is clear drying

  • Suited to the direct method of mosaics as tiles can be coated with glue prior to placement

  • Non-load bearing, can be used on mosaics that either lie flat or have little weight bearing.

     

     

  • Not waterproof making it not suitable to exterior applications

  • Diluted it can be used as a sealant in a ratio of 50:50 to water

EVA - Ethylene Vinyl Acetate

Water resistant version of PVA

  • Can be used on an outside area that will get wet

  • It is water resistant not water proof so do not use in an area that will be submerged in water

Liquid Nails

Construction Adhesive

  • Manufactured by Selleys brand and available in a range of different adhesive for specific applications
  • Available in cartridge gun form but some products are available in smaller squeeze packets.
  • Clear Liquid nails is a handy adhesive in mosaics. Not only is it clear drying, but it is a tacky adhesive which holds heavier tiles in place while drying. It can be used to compensate for variations in thicknesses. Place a dollop onto a disposable sheet and use a tool to apply the adhesive to the mosaic. Do not use Clear Liquid Nails on mirror as it may lead to the mirror de-silvering
  • Platinum Liquid Nails is an extremely strong adhesive but extremely difficult to work with. Do not let the adhesive come into contact with your skin and use only in well-ventilated areas. Not for the faint hearted!

Selleys Kwi Grip Advanced

 

Selleys Kwik Grip Advanced is a non-toxic, low fume, low odour, water-based flexible contact adhesive. Suitable for bonding absorbent and non-absorbent surfaces and ideal for bonding flat, close fitting surfaces. Forms a durable heat and water-resistant bond, being water based it is non-toxic and easy to clean up.

Use to bond: Polystyrene foam (will not degrade the foam) and metals.

Epoxy Resin Two part adhesive
  • Suitable for internal and external mosaic work
  • Comes in two parts, a hardener & resin that are mixed together just before use.
  • Extremely strong adhesive
  • Produces a lot of fumes and must be used in a well-ventilated space.
  • Great for outdoor applications which are constantly wet (e.g. birdbaths)
  • Can hold heavy tesserae pieces (e.g. Stones, Shells)
  • It is the only adhesive that will permanently stick tesserae to metal
  • Can be tricky to work with, as they are extremely sticky, can be quite runny and usually set fairly fast. Not for beginners to mosaics.
Weldbond Similar to PVA glues
  • Recommended by a number of mosaicists for internal mosaics
  • Can be used on cement, concrete, bricks, plaster, metal, glass, wood and tiles
  • Stronger than the average white craft glue
  • Water soluble, no fumes, non-toxic and easy to clean up
  • Dries clear making it suitable to use on glass on glass applications
  • Not waterproof making it not suitable for exterior applications
  • Suited to Direct Method of mosaics as tiles can be coated with glue prior to placement
  • Diluted it can be used as a sealant, mix 4 or 5 parts to one with water for sealing wood and terra-cotta projects
Cement Based Adhesives (polymer modified cement glue) Thin-set is a cement based adhesive
  • Recommended for exterior mosaics
  • Suited for the indirect method of mosaics for making an adhesive bedding. Work best for outdoor work, floor and heavy traffic areas.
  • Best adhesive to use if using the direct method and uneven tesserae.
  • Can be applied like icing. Place in a plastic bag and cut a corner (just like an icing bag)
  • Can be made waterproof by mixing with an acrylic additive. Great for stepping-stones, birdbaths, terracotta and an exterior mosaics.
  • The bond to both the tesserae and the backer material is improved by adding a commercial tile bonding agent and priming the backer material with the same products, before applying the paste.
  • Available from tiling specialists
Mastic Pre-mixed adhesive that is either latex or petrochemical base
 
  • A very sticky, paste-like adhesive
  • It has great slip resistance and works well for vertical surfaces.
  • Applied with a craft stick or palette knife
  • Not recommended for use on floors, under pressure it can become brittle and break down
  • Not recommended for exterior applications or in areas where it will be exposed to moisture
  • Not as strong as cement based adhesives
  • Used to attach tile to drywall
Clear Silicone Silicone
  • Dries clear so great for glass on glass projects
  • Waterproof and flexible
  • Suitable for use on mirror tiles as it won't de-silver the back
  • Make sure the back of the tile is coated completely so that grout cannot seep under the edges and spoil the effect
  • A tacky adhesive which allows heavier pieces to stay in place while drying
  • Strong smelling, use in a well ventilated room

 

Some handy tips:

  • Always follow manufacturers instructions
  • Choose an adhesive that is suitable for your choose base or substrate
  • Work in a well ventilated area
  • Ask advice at your hardware store if you are uncertain about a particular adhesive
  • Don't be tempted to apply too much adhesive, it will squeeze around the sides of the tile and may require clean up work prior to grouting. There needs to be room around the sides of the tiles for grout.
  • As a rule of thumb, the adhesive should cover 25% up the side of the tile
  • Masking or packaging tape can be useful in temporarily supporting tiles while the adhesive dries

9 Responses

Jenny McLean
Jenny McLean

March 15, 2015

Hi Mardi, all I have ever used is Mandala Art Mosaic Glue Paste. It is suitable for indoor or outdoor applications on almost all surfaces including ceramics, terracotta, wood, vinyl, concrete or rubber as long as surfaces are sealed first. It can be bought at Bunnings at about $8 a tube so it is a little pricey but to keep costs down I mail order a heap of tubes at once directly from Mandala Art in Bayswater, Melbourne or pick up from the store. I like the convenience of it as there is no mixing or spreading, just a squeeze from the tube straight onto the work. It is white and dries white but I like that as it brings out the colour in transparent glass.

Gillian M
Gillian M

March 15, 2015

Hey Mardi, very fitting to see this list again. question. I am making a birdbath using glass on a large terracotta saucer. I am using Indirect method. What adhesive should I use, as Tileset (Cement Based Adhesive) may be too thick for my glass pieces. Any suggestions? Thank you.

Gillian M

Lorraine Atherton
Lorraine Atherton

March 15, 2015

I use OPM – One Pack Mastic It comes in powdered form you add water. It is used for tiles in swimming pools so I have used it for outdoor Mosaics and so far has lasted many years

Christie Jackett
Christie Jackett

March 15, 2015

This might seem to be a silly question, but I’m new to mosaics and my idea seems a tall one. I’m making myself a beautiful betta tank using mosaics, but I am having trouble finding clear waterproof cement/sealants (at least I’d like something clear behind the glass beads so that the light will reflect into the water). If my betta tank turns out as I’d like (even though I’m only a beginner, I set myself lofty tasks), I’d like to continue to add mosaic fountains and other water features to my garden.

If anyone can give me a few tips, that would be much appreciated. Thank you and have a wonderful day!

Guest
Guest

March 15, 2015

You can add a cement oxide to grey grout to achieve a black grout. Cement oxide can be purchased from hardware stores but it does come in rather large quantities.

Regards

Mardi

Guest
Guest

March 15, 2015

Thanks Mardi for the information. It is good to know what adhesive to use especially for indoor & outdoor projects. I have been mosaicing for just over 2 years and I am still learning which products to use. Very happy I have this information now. Thanks again.

Guest
Guest

March 15, 2015

Can you tell me how to get a “black” black grout? I have used a couple but they dry like a charcoal. I would like a very black colour?

Guest
Guest

March 15, 2015

Awesome advice. Very handy.

Guest
Guest

March 15, 2015

Thank you sooo much for this info. Even tho I have been into mosaics for two years, I did not know all this. Will pass this on to others in my mosaic group. Thanks again.

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